No.
Since his name is "Neil Armstrong" and "footprints" is just referring to 'the number of something' owned by Neil Armstrong; the correct plural for both words would be Neil Armstrong's footprints.
If you are talking about the Neil Joshi that was on The Suite Life of Zack and Cody, then he's 19. If not, sorry!
Neil's is a homophone of kneels.
The bitter food left an acrid taste in Neil's mouth.
Neil Diamond had a real hit on his hands with "Song sung blue".
Both "I" and "me" are forms of the singular first person pronoun. The difference is that "I" is the subjective form, and "me" is the objective form. The following are examples: I will be taking a day of vacation this Friday. ("I" is the subject.) Please call me if you have any questions. ("Me" is the object.) Neil and I will be in Chicago next week. Sandy sent Paul and me the updated agenda.
No. It should be Neil Armstrong's footprint.
Neil Armstrong was left-handed.
NHL player Chris Neil shoots right.
MLB player Neil Ramirez bats right.
MLB player Neil Ramirez throws right.
MLB player Neil Wagner bats right.
MLB player Neil Wagner throws right.
MLB player Neil Walker throws right.
MLB player Neil Walker can bat right or left (i.e. he is a switch hitter).
Neil Armstrong was left-handed.
Chris Neil plays right wing for the Ottawa Senators.
No.